CLASS RACER FORUM - View Single Post - Data Recorder Shows 300 rpm 'droop' After Car Launches???

KRatcliff · 06-14-2012, 09:32 AM

I cannot answer the question on the Comp cars due to zero experience with them. I can only surmise that the ones you may have seen may be leaving at a significantly higher RPM, the converter may be smaller (ie 7"), and the engine isn't pulled down as much or at all when the converter fully engages.

I have looked at the graphs of many fuel injected stockers and super stockers. Every one of them had the same hump. Even our super stocker with a carb combo has a hump. Most were 2 step cars, but a few were foot brake stockers.

Any tuning that you do for this event is basically behind a curtain and you are not exactly sure what the A/F ratios are due to the action of the 2 step. I have a certain pattern of attack for that event, but that is just for my stuff and I have a lot to learn before I come close to getting these tunes right.

Listen to the others with more experience than me on this. I was just giving you my experience.

06-14-2012, 09:32 AM	#6
KRatcliff Senior Member Join Date: Sep 2011 Posts: 765 Likes: 75 Liked 524 Times in 141 Posts	Re: Data Recorder Shows 300 rpm 'droop' After Car Launches?? I cannot answer the question on the Comp cars due to zero experience with them. I can only surmise that the ones you may have seen may be leaving at a significantly higher RPM, the converter may be smaller (ie 7"), and the engine isn't pulled down as much or at all when the converter fully engages. I have looked at the graphs of many fuel injected stockers and super stockers. Every one of them had the same hump. Even our super stocker with a carb combo has a hump. Most were 2 step cars, but a few were foot brake stockers. Any tuning that you do for this event is basically behind a curtain and you are not exactly sure what the A/F ratios are due to the action of the 2 step. I have a certain pattern of attack for that event, but that is just for my stuff and I have a lot to learn before I come close to getting these tunes right. Listen to the others with more experience than me on this. I was just giving you my experience.